论文标题
混合Bjorken流动吸引子中的流体动力
Hydrodynamization in hybrid Bjorken flow attractors
论文作者
论文摘要
杂种流体模型由两个领域组成,具有更弱且更强烈的自由度自由度,始终如一地耦合,就像在半听觉框架中一样,已显示出具有Bjorken流动的吸引者表面。仅保留两个扇区的简单粘性流体描述,我们发现,在吸引子表面,两个子行动的流体动物化时间随着保形缩放后的流体动物化点的增加而降低,随后缩放,达到其最小值,然后迅速上升。当相应的能量密度属于尺寸间耦合的逆阶时,获得最小值。 Restricting to attractor curves which can be matched to glasma models at a time set by the saturation scale for both $p$-$p$ and Pb-Pb collisions, we find that the more weakly coupled sector hydrodynamizes much later, and the strongly coupled sector hydrodynamizes earlier in $p$-$p$ collisions, since the total energy densities at the respective hydrodynamization times of these sectors fall inside and outside of the共形窗口。这对于现象学相关的解决方案也是如此,这些解决方案在与Glasma模型匹配时显着远离吸引子表面。
Hybrid fluid models, consisting of two sectors with more weakly and more strongly self-interacting degrees of freedom coupled consistently as in the semi-holographic framework, have been shown to exhibit an attractor surface for Bjorken flow. Retaining only the simple viscid fluid descriptions of both sectors, we find that, on the attractor surface, the hydrodynamization times of both subsectors decrease with increasing total energy density at the respective point of hydrodynamization following a conformal scaling, reach their minimum values, and subsequently rise rapidly. The minimum values are obtained when the respective energy densities are of the order of the inverse of the dimensionful inter-system coupling. Restricting to attractor curves which can be matched to glasma models at a time set by the saturation scale for both $p$-$p$ and Pb-Pb collisions, we find that the more weakly coupled sector hydrodynamizes much later, and the strongly coupled sector hydrodynamizes earlier in $p$-$p$ collisions, since the total energy densities at the respective hydrodynamization times of these sectors fall inside and outside of the conformal window. This holds true also for phenomenologically relevant solutions that are significantly away from the attractor surface at the time we match to glasma models.